123112454557 has 2 divisors, whose sum is σ = 123112454558. Its totient is φ = 123112454556.

The previous prime is 123112454539. The next prime is 123112454561. The reversal of 123112454557 is 755454211321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96667515396 + 26444939161 = 310914^2 + 162619^2 .

It is an emirp because it is prime and its reverse (755454211321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123112454557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123112452557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61556227278 + 61556227279.

It is an arithmetic number, because the mean of its divisors is an integer number (61556227279).

Almost surely, 2^123112454557 is an apocalyptic number.

It is an amenable number.

123112454557 is a deficient number, since it is larger than the sum of its proper divisors (1).

123112454557 is an equidigital number, since it uses as much as digits as its factorization.

123112454557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 40.

Adding to 123112454557 its reverse (755454211321), we get a palindrome (878566665878).

The spelling of 123112454557 in words is "one hundred twenty-three billion, one hundred twelve million, four hundred fifty-four thousand, five hundred fifty-seven".